Injection Mould
What is the primary purpose of an injection moulding machine?
Explanation: An injection moulding machine primarily heats plastic until it becomes molten and then injects it into a mould cavity to shape it into a desired product.
Which of the following is NOT a main component of an injection moulding machine?
Explanation: A welding torch is not a part of an injection moulding machine. The main components include the hopper (for feeding plastic), barrel (where plastic is heated), and screw (which pushes molten plastic into the mould).
The function of the screw in an injection moulding machine is to:
Explanation: The screw in an injection moulding machine rotates and mixes plastic pellets, heats them through friction, and then pushes the molten plastic into the mould cavity for shaping.
What type of plastic is commonly used in injection moulding?
Explanation: Thermoplastics like ABS, polypropylene, and polyethylene are commonly used in injection moulding because they can be melted, shaped, and re-melted without losing their properties.
Which step follows injection in the moulding process?
Explanation: After injection, the molten plastic cools and solidifies inside the mould before the next steps, which include ejection of the finished part.
The process of forcing molten plastic into a mould is called:
Explanation: In injection moulding, molten plastic is injected into a mould cavity under high pressure to take the desired shape.
What is the purpose of the ejector system?